Swift version: 5.10
All structs in Swift come with a default memberwise initializer, which is an initializer that accepts values for all the properties in the struct. However, as soon as you add your own initializer to the struct that memberwise initializer goes away, because it’s possible you’re doing special work that the default initializer isn’t aware of.
If you want to keep both the default initializer and your own custom ones, there’s a simple trick: create your initializers inside an extension rather than as part of the main struct definition.
For example:
struct Person {
var firstName: String
var lastName: String
}
extension Person {
init(name: String) {
let split = name.components(separatedBy: " ")
firstName = split.first ?? ""
lastName = split.last ?? ""
}
}
Because my custom initializer is inside an extension, you can create instances of Person
in two ways:
let taylor1 = Person(firstName: "Taylor", lastName: "Swift")
let taylor2 = Person(name: "Taylor Swift")
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Available from iOS 8.0 – learn more in my book Swift Design Patterns
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
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